Analysing both the compressional (PP) and converted (PS) wavefields from a multicomponent seismic survey can provide more information about subsurface structures, lithologies and their fluid saturants. This paper discusses the techniques of jointly interpreting P-wave data in association with converted-wave seismic data. The methods include log analysis, generation of synthetic seismograms, VSP correlation, along with registering, picking, and calculating ratios of the PP and PS sections. Two cases of oilfields in clastic (sand-shale) environments are discussed - the Cambay Basin, India and the Williston Basin (Ross Lake), Saskatchewan. In addition, a carbonate case is considered from the Cantarell oilfield in Mexico. Vp/Vs values from traveltime thickness (isochron) ratios and amplitude inversion are especially useful for characterizing lithologies.


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